CN112943713B - Labyrinth type hydraulic oil tank - Google Patents
Labyrinth type hydraulic oil tank Download PDFInfo
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- CN112943713B CN112943713B CN202110191660.2A CN202110191660A CN112943713B CN 112943713 B CN112943713 B CN 112943713B CN 202110191660 A CN202110191660 A CN 202110191660A CN 112943713 B CN112943713 B CN 112943713B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/047—Preventing foaming, churning or cavitation
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Abstract
The invention provides a labyrinth type hydraulic oil tank, which belongs to the technical field of hydraulic pressure and comprises a non-metal shell, a metal upper cover, an oil return pipe, an oil suction pipe, a sewage discharge magnet spiral cover, an air filter, a liquid level liquid thermometer and a connecting bolt. The non-metal shell is connected with the metal upper cover to divide the interior of the oil tank into a particle gathering area, a degassing area, a secondary impurity removal area and a flow stabilizing area. The vortex generated by the quasi-hemispherical structure promotes the gathering and removal of bubbles and solid particles, and the oil flow is prolonged through the U-shaped flow passage structure, so that the removal efficiency of gas and solid particles in oil is further improved. The blowdown magnet spiral cover is installed under the class hemisphere structure in granule gathering area, can realize the high-efficient absorption of metal particle, and the dismouting of being convenient for realizes the high-efficient cleanness of oil tank. The invention effectively reduces the volume on the premise of ensuring the flow of the system, and has the advantages of miniaturization, light weight, high efficiency in degassing and impurity removal, convenience for batch production and the like.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to a labyrinth type hydraulic oil tank with degassing and impurity removing functions and an oil liquid filtering method.
Background
The hydraulic system is made up of a series of precision components. Due to leakage and the like, contaminants such as air bubbles and solid particles are often mixed in the hydraulic oil, and the existence of the contaminants affects the operation stability of a hydraulic system, and the service life of a hydraulic component and the system is shortened.
In the field of hydraulic engineering, open hydraulic oil tanks are common. The air mixed in the hydraulic oil is generally tiny bubbles with the diameter of 0.25-0.5 mm, and the existence of the bubbles can cause the change of the characteristics of the hydraulic oil and influence the dynamic performance of a system; in addition, the presence of small bubbles can also exacerbate cavitation, cause the system to generate noise and vibration, and erode the surface of the metal components, greatly affecting the life of the hydraulic components and the performance of the hydraulic system.
The hydraulic system has various application occasions, and various solid pollutants can be mixed under severe working conditions. As far as possible, solid particles of various shapes and sizes are suspended in oil, the most common and harmful being insoluble particles of 15-100 μm diameter. The solid particles can damage surface oil films between kinematic pairs in the hydraulic elements to cause mechanical abrasion, and the phenomenon of locking of precision elements can be caused when larger particles enter a hydraulic system, so that the operation safety of the system is seriously threatened.
According to practical experience and experimental research, the fault occupation ratio of the hydraulic system caused by hydraulic oil pollution is up to 70-80%, and air bubbles and solid particles are prevented from entering the hydraulic system as much as possible. The hydraulic oil tank is the main carrier for the removal of gaseous and solid particulate contaminants in hydraulic systems. At present, the hydraulic oil tank is designed according to an analog design method, pollutant removal is promoted through a large oil liquid volume (generally 2-7 times of the system flow), the problems of large volume and heavy weight exist, and the development of light and small engineering machinery in modern industry is not facilitated. Meanwhile, if the hydraulic oil tank is miniaturized, the retention time of oil in the oil tank can be reduced, and the degassing and impurity removing functions are weakened to a great extent.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the labyrinth type hydraulic oil tank and the oil liquid filtering method, which can effectively reduce the volume of the oil tank on the basis of meeting the flow of a hydraulic system and can realize the efficient separation of gas and solid pollutants.
In particular to a labyrinth type hydraulic oil tank which comprises a non-metal shell, a metal upper cover, a metal clapboard and a pollution discharge magnet spiral cover,
the metal upper cover is arranged above the nonmetal shell, the metal upper cover is provided with a metal partition plate with an air hole, and an air filter is arranged at the upper part of the metal upper cover;
an oil return pipe is arranged at the upper part of the side surface of the non-metal shell, an oil suction pipe is arranged at the lower part of the non-metal shell, and a liquid level liquid thermometer is arranged on the front surface of the non-metal shell; the oil return pipe at the upper part of the side surface of the non-metal shell is provided with a quasi-hemispherical structure, the shape of the quasi-hemispherical structure is a structure with an upper part and a lower part being round, the middle upper part of the non-metal shell is provided with a U-shaped flow passage structure, the U-shaped flow passage structure is divided into snake-shaped flow passages by a metal partition plate, air areas above oil liquid at two sides of the partition plate are communicated through vent holes, and the area where the oil suction pipe of the non-metal shell is located is provided with a 15-degree inclined flow passage structure;
the non-metal shell and the metal upper cover divide a flow channel in the oil tank into four functional areas, wherein the four functional areas respectively comprise a quasi-hemispherical structural area, an upper liquid surface partial area, a U-shaped flow channel structural area and a 15-degree inclined flow channel structural area, and the quasi-hemispherical structural area is a particle aggregation area; the upper liquid level part area is a degassing area; the U-shaped flow channel structure area is a secondary impurity removal area; the 15-degree inclined flow channel structure area is a flow stabilizing area;
the non-metal shell is provided with a reinforcing rib plate and an integrated rib plate structure, and the reinforcing rib plate is arranged at the upper part of the U-shaped flow passage structure and on the outer surface of the 15-degree inclined flow passage structure; the integrated rib plate is arranged in the middle of the 15-degree inclined flow channel structure at the lower part and penetrates through the non-metal shell, and the height of the center of the integrated rib plate is consistent with that of the oil suction pipe;
the sewage discharge magnet screw cap is arranged at the bottom of the similar hemispherical structure and is in sealing connection with the similar hemispherical structure through threads.
Preferably, the non-metal shell is formed by rotational molding of a cross-linked polyethylene material.
Preferably, the metal upper cover is made of stainless steel, an air filter installation boss is arranged on the upper surface of the metal upper cover, a metal partition plate is arranged on the lower surface of the metal upper cover, a vent hole is formed in the metal partition plate, and the metal partition plate is connected with the metal upper cover in a welding mode.
Preferably, the metal partition plate is provided with a vent hole, and the vent hole is used for communicating air areas on two sides.
Preferably, the oil return pipe is arranged at the position where the quasi-hemispherical structure is intersected with the straight wall of the non-metal shell, the oil return pipe is downward, the tail end of the oil return pipe is provided with a 45-degree oblique angle, and the length of the oil return pipe is half of that of the quasi-hemispherical structure;
preferably, the oil suction pipe is arranged at the tail end of the 15-degree inclined flow passage structure, the oil suction pipe is upward and provided with a 45-degree oblique angle, and the distance between the tail end of the oil suction pipe and the wall surface is 3 times of the pipe diameter.
Preferably, a permanent magnet is arranged in the pollution discharge magnet screw cap.
Preferably, the air filter is arranged at the position of the upper part of the oil tank far away from the oil return area; the liquid level liquid thermometer is installed at the position, far away from the oil return area, of the right side of the oil tank.
Preferably, the effective volume of the labyrinth type hydraulic oil tank is 0.8 times of the rated flow of the hydraulic system, and the occupied area is about 1.5 times of the rated flow of the hydraulic system.
Preferably, the invention also provides a method for filtering oil, which comprises the following steps:
s1, enabling the oil to flow into the non-metal shell through an oil return pipe, enabling the oil to enter a particle collection area and a degassing area, enabling the oil to obliquely and downwards wash onto the right side wall surface of the quasi-hemispherical structure under the action of a 45-degree oblique angle, and forming a plurality of vortex flow fields inside the quasi-hemispherical structure under the action of an arc-shaped wall surface, wherein the vortex flow fields can prolong the residence time of the oil in the particle collection area, promote the floating and precipitation of bubbles, and primarily remove the bubbles from the oil; solid particles with larger diameter in the oil are thrown onto the wall surface under the action of centrifugal force in the vortex, and the pollution discharge magnet screw cap enables metal particles with smaller diameter in the oil to be forcibly separated from a flow field under the action of magnetic force and to be adsorbed and gathered on the permanent magnet at the bottom together with large particles, so that particle pollutants are removed for the first time;
s2, the oil liquid passes through the particle gathering area and then enters a secondary impurity removing area, and the remaining bubbles and non-metal particles stay in the snake-shaped flow passage for a long time, so that the time for particle sedimentation and bubble precipitation can be effectively prolonged, and the bubbles and particles of the oil liquid are removed secondarily;
s3, the oil enters the inclined flow passage structure of the flow stabilizing area, the flow speed of the oil in a large space is reduced, the oil flows smoothly, and the oil suction pipe sucks oil stably.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with the traditional hydraulic oil tank, the labyrinth type hydraulic oil tank has the advantages of small volume, light weight, strong capability of removing gas and impurities, convenience for batch production and the like. After oil enters the hydraulic oil tank from the oil return pipe, vortex is formed in a particle gathering area at first to gather particles and bubbles, particle gathering and primary degassing are achieved, a flow is added to a snake-shaped flow channel, so that the retention time of the oil is prolonged, the removal efficiency of gas and solid particles in the oil is improved, and the oil flows slowly and stably through a large flow stabilizing area below the oil. The non-metal shell is provided with the reinforcing rib plate and the integrated rib plate, so that the rigidity of the integrated oil tank is enhanced, and the integrated oil tank is convenient to install and use.
(2) After entering the oil tank from the oil return pipe, the oil liquid is retained in the particle collection area A under the action of vortex, and finally collected in the pollution discharge magnet spiral cover 5 under the action of magnetic force and gravity. From the results, it was found that the removal rate of the metal particles having a diameter of 200 μm was 62% and the removal rate of the particles having a diameter of 500 μm was 100%. On the other hand, the hydraulic oil tank not only has the effect of removing particles, but also has the effect of removing bubbles contained in oil and the effect of stabilizing flow, and the gas removal rate can reach more than 60 percent through later verification.
Drawings
Fig. 1 is a schematic structural view of a labyrinth type hydraulic oil tank according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a metal top cover according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a sewage magnet screw cap according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a structure according to an embodiment of the present invention;
fig. 5 is a functional block schematic diagram of a labyrinth type hydraulic oil tank according to an embodiment of the present invention;
FIG. 6 is a comparison of parameters of a labyrinth type hydraulic tank according to an embodiment of the present invention and a conventional hydraulic tank having a similar volume;
fig. 6a is one of comparison graphs of flow field flow lines of a labyrinth type hydraulic oil tank with different lengths of oil return pipes according to an embodiment of the invention;
fig. 6b is a second comparison diagram of flow field flow lines of the labyrinth type hydraulic oil tank according to the embodiment of the present invention at different lengths of the oil return pipe;
fig. 6c is a third comparison graph of flow field flow lines of the labyrinth type hydraulic oil tank in different lengths of the oil return pipe according to the embodiment of the invention;
FIG. 7 is a cloud of oil velocity profiles for a labyrinth-type hydraulic tank in accordance with an embodiment of the present invention;
FIG. 8 is a flow diagram of an oil flow field of a labyrinth type hydraulic tank in accordance with an embodiment of the present invention;
FIG. 9a is one of the comparison of cloud plots of flow field turbulence kinetic energy distribution of a labyrinth type hydraulic tank and a conventional hydraulic tank in accordance with an embodiment of the present invention;
FIG. 9b is a second comparison of cloud plots of flow field turbulence kinetic energy distributions of a labyrinth type hydraulic tank and a conventional hydraulic tank in accordance with an embodiment of the present invention;
FIG. 10 is a cloud of the gas volume fraction distribution of bubbles with a diameter of 100 μm in a labyrinth-type hydraulic oil tank according to an embodiment of the present invention;
FIG. 11 is a diagram showing the simulation result of the movement locus of metal particles with a diameter of 200 μm in a labyrinth type hydraulic oil tank according to an embodiment of the present invention;
fig. 12 is a graph showing the simulation result of the movement locus of metal particles with a diameter of 500 μm in a labyrinth type hydraulic oil tank according to an embodiment of the present invention.
Some of the reference numbers in the figures are as follows:
1-a non-metallic housing; 2, a metal upper cover; 21, mounting a boss; 22-a separator; 3-oil return pipe; 4-oil suction pipe; 5, screwing a cover with a blowdown magnet; 51-a permanent magnet; 52, screwing a cover; 6-air filter; 7-liquid level liquid thermometer; 8, connecting bolts.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 schematically shows a labyrinth type hydraulic oil tank according to one embodiment of the invention, which comprises a non-metal shell 1, a metal upper cover 2, an oil return pipe 3, an oil suction pipe 4, a pollution discharge magnet spiral cover 5, an air filter 6, a liquid level thermometer 7 and a connecting bolt 8. The upper part of the side surface of the non-metal shell 1 is provided with an oil return pipe 3, and the lower part is provided with an oil suction pipe 4. The front of non-metal casing 1 is provided with liquid level liquid thermometer 7, and the oil return pipe end of non-metal casing 1 is provided with type hemisphere structure, and the well upper portion of non-metal casing 1 inside is provided with U type runner structure, inhales the oil pipe region and is provided with to be 15 inclined flow channel structures.
The non-metal shell 1 is provided with a reinforcing rib 11, a reinforcing rib 12, a reinforcing rib 13 and an integrated rib 14. The reinforcing rib plates are arranged in the areas of the U-shaped flow channel and the lower inclined flow channel, and do not penetrate through the non-metal shell 1. The integrated rib plate 14 is arranged in the middle of the lower flow passage and penetrates through the non-metal shell 1, and the height of the center of the integrated rib plate 14 is consistent with that of the oil suction pipe 4.
A metal upper cover 2 is arranged above the nonmetal shell 1, an air filter 6 is arranged on the upper portion of the metal upper cover 2, and the metal upper cover 2 is connected with the nonmetal shell 1 through a connecting bolt 8.
Be provided with blowdown magnet spiral cover 5 under the 1 type hemisphere structure of non-metal casing, and blowdown magnet spiral cover 5 carries out sealing connection through screw thread and non-metal casing 1 to convenient the dismantlement.
In one embodiment, as shown in fig. 2 and 3, the upper surface of the metal upper cover 2 is provided with a mounting boss 21 for fixing the air cleaner 6, so as to realize functions of air filtration and oil filling of the open hydraulic oil tank.
The lower surface of the metal upper cover 2 is provided with a partition plate 22, the metal upper cover 2 is connected with the metal upper cover 2 in a welding mode, the middle of the partition plate 22 is provided with a vent hole, and the partition plate 22 communicates air areas on liquid surfaces on the left side and the right side of the U-shaped flow channel to ensure that the liquid surfaces on the two sides can be communicated with the atmosphere. A partition plate 21 is arranged on the metal upper cover 2, and the partition plate 21 is placed in the middle of the U-shaped flow channel structure to divide the flow channel into a snake-shaped flow channel.
The pollution discharge magnet screw cap 5 comprises a permanent magnet 51 and a screw cap 52. The pollution discharge magnet screw cap 5 is arranged at the bottom of the hemisphere-like structure. The permanent magnet 51 is disposed inside the filth discharge magnet screw cap 5.
In one embodiment, as shown in fig. 4, the oil return pipe 3 is arranged at the boundary of the quasi-hemispherical structure and the straight wall of the non-metallic housing 1, the insertion depth of the oil return pipe 3 is half of the length of the quasi-hemispherical structure, and the tail end of the oil return pipe 3 is provided with a 45 ° oblique angle with the oblique direction downward.
The oil suction pipe 4 is arranged on the left side of the 15-degree inclined flow passage structure, the pipe end of the oil suction pipe 4 is provided with a 45-degree oblique angle, the inclined direction is upward, and the distance between the pipe end of the oil suction pipe 4 and the wall surface is 3 times of pipe diameter.
When the hydraulic oil tank according to the embodiment is used, oil enters the rear non-metal shell 1 from the oil return pipe 3 and then flows out of the oil suction pipe 4 through the quasi-hemispherical structure, the U-shaped flow passage structure and the 15-degree inclined flow passage structure, the labyrinth-shaped flow passage increases the flow path, a vortex structure is formed, and therefore the particle separation efficiency is increased; the residence time of the oil in the hydraulic oil tank is prolonged, the precipitation time of bubbles in the oil is prolonged, and the separation efficiency of the bubbles is improved.
In a preferred embodiment, as shown in fig. 5, the combination of the hemisphere-like structure, the U-shaped flow passage structure and the 15 ° inclined flow passage structure in the metal upper cover 2 and the non-metal housing 1 forms a labyrinth-type flow passage inside the hydraulic oil tank. According to the function, the interior of the oil tank can be divided into four functional areas, namely a particle aggregation area A, a degassing area B, a secondary impurity removal area C and a flow stabilization area D.
The degassing area B is positioned above the particle aggregation area A, the residence time of oil in the particle aggregation area is prolonged due to the vortex flow field, the floating and separation of bubbles are promoted, and the purpose of primary degassing is achieved.
Secondary edulcoration district C comprises snakelike runner and the air cleaner 6 that metal upper cover 2 and U type runner structure cooperation formed, and behind fluid particle gathering district A, remaining bubble and non-metallic particle dwell time can prolong in snakelike runner to can effectively increase the granule and subside and the time that the bubble is appeared, realize the secondary of bubble and granule and get rid of.
The flow stabilizing area D is composed of a 15-degree inclined flow channel structure at the lower portion of the oil tank, an integrated rib plate 14 and an oil suction pipe 4, oil basically finishes degassing and impurity removal after passing through the three functional areas ABC, the flow speed of the oil in a large space is reduced, the oil flows smoothly, stable oil suction of the oil suction pipe is facilitated, and the integrated rib plate 14 is arranged at a position right opposite to the oil suction pipe 3, so that pollutants can be prevented from being directly sucked into the oil suction pipe 3.
The particle aggregation area A consists of an oil return pipe 3 and a quasi-hemispherical structure, oil flows into the non-metal shell 1 through the oil return pipe 3, obliquely and downwards impacts the right side wall surface of the quasi-hemispherical structure under the action of a 45-degree oblique angle, and a plurality of vortexes are formed inside the quasi-hemispherical structure under the action of the approximately arc-shaped wall surface; solid particles with larger diameter in the oil are thrown onto the wall surface under the action of centrifugal force in the vortex; the separation effect of the metal particles with smaller diameters under the action of vortex is not obvious.
The pollution discharge magnet screw cap 5 has the advantages that metal particles with smaller diameters in oil can be forced to be separated from a flow field under the action of magnetic force and adsorbed and gathered on the bottom permanent magnet 51 together with large particles, and the removal capacity of the particles is further improved.
In a preferred embodiment according to the invention, the structural design and the performance analysis thereof were studied in detail, wherein a conventional single-diaphragm hydraulic tank with a similar volume was selected for comparison in order to highlight the degassing and decontaminating capabilities of the labyrinth-type hydraulic tank of the invention.
In a preferred embodiment, as shown in the following table, the table shows the parameter comparison between the conventional hydraulic oil tank and the labyrinth-type hydraulic oil tank of the present invention, and it can be seen that, on the basis of the substantially same size, due to the labyrinth-type complex flow channel structure design, the specific surface area of the labyrinth-type hydraulic oil tank, i.e. the ratio of the surface area to the volume, is about 1.8 times that of the conventional hydraulic oil tank, which indicates that the heat dissipation area is greatly increased. Compared with the traditional hydraulic oil tank, the degassing rate of the labyrinth type hydraulic oil tank, namely the ratio of the volume fraction of gas at the oil suction pipe to the volume fraction of gas at the oil return pipe, is greatly improved by about 2 times. For the removal rate of metal particles, namely the ratio of the number of particles at an oil suction port to the number of particles at an oil return port, the traditional hydraulic oil tank is 60 percent, and the labyrinth type hydraulic oil tank is up to 82 percent, so that the removal rate is remarkably improved; to the clearance of rubber granule, the particle number of oil sucking mouth department compares with the particle number of oil return mouth department promptly, traditional hydraulic tank is 40%, and the labyrinth type hydraulic tank of this patent is 50%, has apparent promotion.
In a preferred embodiment, as shown in fig. 6, the insertion depth of the oil return pipe of the labyrinth type hydraulic oil tank is studied, wherein (a) 1/3 with the length of the hemisphere-like structure is inserted into the structure, (b) 1/2 with the length of the hemisphere-like structure is inserted into the structure, and (c) 3/4 with the length of the hemisphere-like structure is inserted into the structure; analysis of the flow chart shows that only when the insertion depth is 1/2 with the length of the hemispheric-like structure, the vortex action in the particle accumulation area A is obvious, and the vortex exists in the whole area, so that the separation of particles and bubbles from oil liquid can be better realized, and therefore 1/2 with the insertion depth being the length of the hemispheric-like structure is the preferred structure.
In a preferred embodiment, as shown in fig. 7, the oil in the labyrinth type hydraulic oil tank is simulated to obtain an oil speed cloud graph, and it can be seen that the flow speed of the oil in the whole oil tank is higher at the oil return port, the flow speed in the internal area of the oil tank is very slow, and the flow speed at the oil suction port is about 0.5m/s, which meets the flow speed requirement of the oil suction port of the hydraulic system of a general engineering machine.
In a preferred embodiment, as shown in fig. 8, a flow field in a preferred structure is simulated, and as can be seen from a flow chart, after oil enters an oil tank from an oil return pipe, a plurality of symmetrical vortexes can be formed in a particle aggregation area a, the flow field is relatively turbulent, and bubbles and particles can be promoted to be separated from the oil; after the secondary impurity removal area C, the streamline is obviously smooth, the flowing state of the oil in the steady flow area D is stable, and the oil absorption pipe 4 is favorable for stably absorbing oil.
In a preferred embodiment, as shown in fig. 9, in order to verify the flow stabilizing capability of the labyrinth type hydraulic oil tank of the present invention, the turbulence kinetic energy in the flow field is analyzed, and the maximum turbulence kinetic energy at the oil suction port of the labyrinth type hydraulic oil tank can be found to be 0.31m through simulation 2 /s 2 While the maximum turbulent kinetic energy at the oil suction port of the traditional hydraulic oil tank is 0.35m 2 /s 2 The flow stabilizing capacity is improved by 11 percent.
In a preferred embodiment, as shown in fig. 10, the euler model in Fluent is used to analyze the distribution of bubbles with the diameter of 100 μm in hydraulic oil, and as can be obtained from a gas volume fraction cloud chart, the gas accounts for 8% when the oil returns to the tank, 3.2% remains when the oil reaches the oil suction port, and the gas removal rate is 60%; the bubbles in the oil are mainly tiny bubbles with the diameter of 0.25-0.5 mm, so that the labyrinth type hydraulic oil tank has strong bubble removal capability through simulation of bubbles with the diameter of 100 mu m.
In a preferred embodiment, as shown in fig. 11, the DPM model in Fluent is used to analyze the motion track of metal particles with the diameter of 200 μm in hydraulic oil, and after the particles enter the oil tank from the oil return pipe, the particles are retained in the particle accumulation area a under the action of vortex and finally accumulated in the blow-down magnet screw cap 5 under the action of magnetic force and gravity. From the results, it was found that the metal particle removal rate at 200 μm was 62%.
In a preferred embodiment, as shown in fig. 12, when the DPM model in Fluent is used to analyze the motion trajectory of metal particles with a diameter of 500 μm in hydraulic oil, the effect of the particle aggregation area a is more obvious, almost all particles are aggregated at this area, a few particles are also settled at the bottom when flowing through the serpentine flow channel at the secondary impurity removal area C, and through the analysis result, the removal rate of the particles with a diameter of 500 μm by the labyrinth-type hydraulic oil tank is 100%.
In this embodiment, as shown in fig. 11 and 12, since the effect of the magnet is not considered in the simulation, the removal capability of particles with diameters of 200 μm and 500 μm is analyzed, and it is known from the foregoing analysis that efficient removal cannot be achieved only by the vortex effect, but in this embodiment, the pollution discharge magnet cap can enhance the removal efficiency of the small-diameter particles by the effect of the magnetic field, and therefore, it can be predicted that the particle removal capability of the labyrinth type hydraulic oil tank is strong on the basis of the removal rate obtained by the flow field simulation.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention made by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. A labyrinth type hydraulic tank is characterized in that: which comprises a non-metal shell, a metal upper cover, a metal clapboard and a blow-down magnet screw cover,
the metal upper cover is arranged above the non-metal shell and provided with a metal partition plate with an air hole, and an air filter is arranged on the upper part of the metal upper cover;
an oil return pipe is arranged at the upper part of the side face of the non-metal shell, an oil suction pipe is arranged at the lower part of the non-metal shell, and a liquid level liquid thermometer is arranged on the front face of the non-metal shell; the oil return pipe at the upper part of the side surface of the non-metal shell is provided with a quasi-hemispherical structure, the shape of the quasi-hemispherical structure is a structure with an upper part and a lower part being round, the middle upper part of the non-metal shell is provided with a U-shaped flow passage structure, the U-shaped flow passage structure is divided into snake-shaped flow passages by a metal partition plate, air areas above oil liquid at two sides of the partition plate are communicated through vent holes, and the area where the oil suction pipe of the non-metal shell is located is provided with a 15-degree inclined flow passage structure;
the non-metal shell and the metal upper cover divide a flow channel in the oil tank into four functional areas, wherein the four functional areas respectively comprise a quasi-hemispherical structural area, an upper liquid surface partial area, a U-shaped flow channel structural area and a 15-degree inclined flow channel structural area, and the quasi-hemispherical structural area is a particle aggregation area; the upper liquid level part area is a degassing area; the U-shaped flow channel structure area is a secondary impurity removal area; the 15-degree inclined flow channel structure area is a flow stabilizing area;
the non-metal shell is provided with a reinforcing rib plate and an integrated rib plate structure, and the reinforcing rib plate is arranged at the upper part of the U-shaped flow passage structure and on the outer surface of the 15-degree inclined flow passage structure; the integrated rib plate is arranged in the middle of the 15-degree inclined flow channel structure at the lower part and penetrates through the non-metal shell, and the height of the center of the integrated rib plate is consistent with that of the oil suction pipe;
the sewage discharge magnet screw cap is arranged at the bottom of the similar hemispherical structure and is in sealing connection with the similar hemispherical structure through threads.
2. Labyrinth-type hydraulic tank according to claim 1, characterized in that: the non-metal shell is formed by rotational molding of a cross-linked polyethylene material.
3. Labyrinth-type hydraulic tank according to claim 1, characterized in that: the metal upper cover is made of stainless steel materials, an air filter installation boss is arranged on the upper surface of the metal upper cover, a metal partition plate is arranged on the lower surface of the metal upper cover, an air hole is formed in the metal partition plate, and the metal partition plate is connected with the metal upper cover in a welding mode.
4. Labyrinth-type hydraulic tank according to claim 1, characterized in that: the metal partition plate is provided with vent holes, and the vent holes are used for communicating air areas on two sides.
5. Labyrinth-type hydraulic tank according to claim 1, characterized in that: the oil return pipe is arranged at the position where the quasi-hemispherical structure is intersected with the straight wall of the non-metal shell, the direction of the oil return pipe is downward, the tail end of the oil return pipe is provided with a 45-degree oblique angle, and the length of the oil return pipe is half of that of the quasi-hemispherical structure.
6. Labyrinth-type hydraulic tank according to claim 1, characterized in that: the oil suction pipe is arranged at the tail end of the 15-degree inclined flow passage structure, the oil suction pipe is upward and provided with a 45-degree oblique angle, and the distance between the tail end of the oil suction pipe and the wall surface is 3 times of the pipe diameter.
7. The labyrinth type hydraulic tank of claim 1, characterized in that: and a permanent magnet is arranged in the pollution discharge magnet screw cap.
8. Labyrinth-type hydraulic tank according to claim 1, characterized in that: the air filter is installed on the upper portion of the oil tank and far away from the oil return area, and the liquid level liquid thermometer is installed on the right side of the oil tank and far away from the oil return area.
9. Labyrinth-type hydraulic tank according to claim 1, characterized in that: the effective volume of the labyrinth type hydraulic oil tank is 0.8 times of the rated flow of the hydraulic system, and the occupied area is 1.5 times of the rated flow of the hydraulic system.
10. The labyrinth type hydraulic tank of claim 1, characterized in that: the method for filtering oil by utilizing the labyrinth type hydraulic oil tank comprises the following steps:
s1, enabling the oil to flow into the non-metal shell through an oil return pipe, enabling the oil to enter a particle collection area and a degassing area, enabling the oil to obliquely and downwards wash onto the right side wall surface of the quasi-hemispherical structure under the action of a 45-degree oblique angle, and forming a plurality of vortex flow fields inside the quasi-hemispherical structure under the action of an arc-shaped wall surface, wherein the vortex flow fields can prolong the residence time of the oil in the particle collection area, promote the floating and precipitation of bubbles, and primarily remove the bubbles from the oil; solid particles with larger diameter in the oil are thrown onto the wall surface under the action of centrifugal force in the vortex, and the pollution discharge magnet screw cap enables metal particles with smaller diameter in the oil to be forcibly separated from a flow field under the action of magnetic force and to be adsorbed and gathered on the permanent magnet at the bottom together with large particles, so that particle pollutants are removed for the first time;
s2, allowing the oil to pass through the particle collection area and then enter a secondary impurity removal area, and prolonging the retention time of the remaining bubbles and non-metal particles in the snake-shaped flow passage, so that the time for settling the particles and separating out the bubbles can be effectively prolonged, and the bubbles and the particles of the oil are removed secondarily;
s3, oil enters the inclined flow passage structure of the flow stabilizing area, the flow speed of the oil in a large space is reduced, the flow is smooth, and the oil absorption pipe performs stable oil absorption.
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